build: add CentOS 8 support; drop CentOS 7
Refs: #5040, #5087
Change-Id: I6dcc5e9ee6b4839a6b3f15f1ad6dabf140301ae4
diff --git a/.jenkins.d/README.md b/.jenkins.d/README.md
index 7c78349..9087f0f 100644
--- a/.jenkins.d/README.md
+++ b/.jenkins.d/README.md
@@ -1,33 +1,25 @@
-CONTINUOUS INTEGRATION SCRIPTS
-==============================
+# CONTINUOUS INTEGRATION SCRIPTS
-Environment Variables Used in Build Scripts
--------------------------------------------
+## Environment Variables Used in Build Scripts
-- `NODE_LABELS`: the variable defines a list of OS properties. The set values are used by the
- build scripts to select proper behavior for different OS.
+- `NODE_LABELS`: space-separated list of platform properties. The included values are used by
+ the build scripts to select the proper behavior for different operating systems and versions.
- The list should include at least `[OS_TYPE]`, `[DISTRO_TYPE]`, and `[DISTRO_VERSION]`.
+ The list should normally contain `[OS_TYPE]`, `[DISTRO_TYPE]`, and `[DISTRO_VERSION]`.
- Possible values for Linux:
+ Example values:
- * `[OS_TYPE]`: `Linux`
- * `[DISTRO_TYPE]`: `Ubuntu`
- * `[DISTRO_VERSION]`: `Ubuntu-16.04`, `Ubuntu-18.04`
+ - `[OS_TYPE]`: `Linux`, `OSX`
+ - `[DISTRO_TYPE]`: `Ubuntu`, `CentOS`
+ - `[DISTRO_VERSION]`: `Ubuntu-16.04`, `Ubuntu-18.04`, `CentOS-8`, `OSX-10.14`, `OSX-10.15`
- Possible values for macOS:
-
- * `[OS_TYPE]`: `OSX`
- * `[DISTRO_TYPE]`: `OSX` (can be absent)
- * `[DISTRO_VERSION]`: `OSX-10.12`, `OSX-10.13`, `OSX-10.14`
-
-- `JOB_NAME`: optional variable to define type of the job. Depending on the defined job type,
+- `JOB_NAME`: optional variable that defines the type of build job. Depending on the job type,
the build scripts can perform different tasks.
Possible values:
- * empty: default build process
- * `code-coverage` (Ubuntu Linux is assumed): debug build with tests and code coverage analysis
- * `limited-build`: only a single debug build with tests
+ - empty: default build task
+ - `code-coverage`: debug build with tests and code coverage analysis (Ubuntu Linux is assumed)
+ - `limited-build`: only a single debug build with tests
-- `WAF_JOBS`: number of parallel build jobs used by waf, defaults to 1.
+- `WAF_JOBS`: number of parallel build threads used by waf, defaults to 1.